Sound-amplifying device.



P. 1. HACKETL- SOUND AMPLIFYING DEVICE.

APPLICATION FILED JULY 6, 19I4.

Patented Aug. 10, 1915.

PAUL J. HACKETT, OF SEATTLE, WASHIN GT cured to the magnet by the bolts 7 and nuts of lVashington,

TELEPHONE COMPANY, OF

i To all who? it may dancer/1a: 1 5

Be it known that I, PAUL J. HACKEIIT, a citlzen'offthe United States, and a resident of Seattle, in'the county of King and State and useful Improvements in Sound-Amplifying Devices, o f whichthe following is a specification. f

This-invention relatesto sound amplifying devices and has for its principalobject to provide means for amplifying the movement of a diaphragm, with a minimum of resistance and friction due to the weight and inertia of the moving parts, and also to provide means for, regulating the amount of amplification o'f a diaphragm.

I attain these objects by the mechanism illustrated in the accompanying drawings, described in the following specifications and pointed out in the appended claims.

In the drawings, of my device, with certain parts broken away. Fig. 2 is a side elevation, partly in section.

Referring now more partitularly to the drawings, reference numeral 1 designates a permanent magnet of the usual type, having a coil 2, with pole tips 2, an armature 3 one end of whi rests upon one pole of the magnetfbeing held in place by lugs l which project from the magnet.- The other end of the armature is drawn to the pole tips 2 of the coil by the attraction of the magnet. A spring 4;, having a slot 4 down its center to admit the wire. 5 to pass through it, bears against the armature and thereby assists the attraction of the magnet to hold the. armature to the magnet, the said spring having adjusting screws 4 and being secured to frame pieces 6 which are sethus forming a support to which is secured a block 8 by means of screws 8*.

tached to the said block, by screws 8", is a 4 frame piece 6. Through an aperture 9 in the block 8 a pin 9 is adjusted to slide under the action of an adjusting screw 10 which has a head 10 which bears against the block 8, thereby retaining the pin 9. One end of the wiri5 is attached to the inner ends of the said pin and the other end of the said wire is attached to the armature at 5. Resting on outstanding members 6 and secured to the upper frame pieces 6 and 6, by means of the screws 11, is a circular diaphragm Specification of Letters Patent. Application filed July 6, 1914. Serial No. 849,275.

ing 12 in the bottom of the said case.

have invented certain new sound tube 15.

Figure 1 is a plaii view armature are ON, ASSIGNOR TO UNIVERSAL HIGH .PQWER KING COUNTY, WASHINGTON.

' SOUND-AMPLIFYING DEVICE.

Patented Aug. 1a, 1915.

case 12, there being a recess 12 and an open- Resilient insulating, rings 13 fit within the recess l2, sald rings securely holding a dia phragm 14:. A cover 15 fits the case 12 tightly and is secured to the same by screws 16. Screwing into the said cover 15 is a Passing through the center oflthe diaphragm 14 is a rod 17 held to the sald dia'phragm by a nut 17, the lower end of the ,rod terminating in an eye 17 to which secured one end of a wire 18 whose other is attached to the wire 5at 18.

-"Surrofunding-the above mentioned apparatus is'al casing 19 which is held to an endplate 20 by means of screws 19, the said end;plate being secured to the magnet 1 by Passing through the rooted to the coil 2 by wires 22.

My device is further explained as follows:

The wires 5 and 18 are held in tension by the resiliency of the spring 4: and the attraction of the electromagnet. This tension may be adjusted by the screws 10. In like manner, the angle made by the wire 5 with the ho rizogtal plane may e varied by adjusting the nuts 17, thereby shortening or lengthening the distance from the wire 5 to the diaphragm 14 and changing the leverage. It will be readily understood that any slight inward or downward movement given to the almature will cause a change in the angle of the wire 5, thereby causing the wire 18 and the rod 17 to move upward or downward, as the case may be. The said movement of the wire 18 and the rod 17 will, of course, be much greater than the movement of the wire 5 due to the change in the ang'ularity ofjthe wire 5. The movements phragm 14..

From the foregoing it will be seen that by the rise of my device small movements of the.

sion through the diaphragm, and thatthe amount of movement may be changed by much amplified in transmis-- simply varying the angle which the wire 5 makes with respect to the horizontal plane. It is also clear that the above mentioned amplified movements of the diaphragm are accomplished without the use of levers in the usual sense of the word, as is common in the art, and the movements of all the parts of my deviceare accomplished with a 119 minimum of friction and inertia, due the extreme lightness of the parts and to the. peculiar arrangement of the same. .I have shown a particular form of embodiment of my invention but am aware that many. minor changes therein will readily" suggest themselves to others skilled in the art without departing from'the spirit. and scope of the invention, and I therefore desire to avoid being limited to the exact form shown and described except as defined by' the appended claims; I 1

What I claim as new and desire to pro tect by Letters Patent is 1. In a telephone receiverincludinga supporting frame, diaphragm and magnets, the

combination of means for amplifying the vibrations of the diaphragm in varying degree, the said means including an'adjusting screw and a flexibleconn'ectionbetween the same and the armature of the-magnet, a spring which normally tends to hold the said armatureagainst the poles'ofthe mag-'- net, and a secondflexible connection between the diaphragm and the first mentioned flexi connection between said screw and the arma- I ture of the magnet, a secondflexible connection between the first mentioned flexible connect ion and the diaphragm, and adjustingnnts therefor, 'a'leaf spring having a slot through which the first mentioned flexible connection passes, the Y said leaf spring having one of ends adjustably mounted upon th supporting framegandlits free end in contact with the armature; a J.HACKETT. Witnesses: n V

FRED P. GORIN,

EMMA KROGER. 

